Sure, but the point is that now that a potential shooter knows that these daily inspections happen, they're not going to bring twenty suitcases full of guns and

Sure, but the point is that now that a potential shooter knows that these daily inspections happen, they're not going to bring twenty suitcases full of guns and ammo. They're going to bring two or three suitcases full of guns and ammo, and still have enough firepower to do the same amount of damage the guy in 2017 did. This is all just security theater. And like most security theater, it infringes on what should be legally-mandated privacy rights. But of course we don't have those here in the US.